2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $200,000 $400,000 $600,000 $800,000 $1,000,000 $1,200,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $568,376 | 22,296 | 73,940 |
| 2006 | $791,421 | 20,664 | 94,538 |
| 2007 | $704,323 | 22,167 | 102,180 |
| 2008 | $1,008,043 | 38,761 | 166,058 |
| 2009 | $829,031 | 30,259 | 199,279 |
| 2010 | $945,028 | 43,005 | 183,253 |
| 2011 | $799,987 | 23,024 | 167,883 |
Note: Quantity represents Number of pairs
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